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Regulations last checked for updates: May 17, 2025
Title 30 - Mineral Resources last revised: Apr 14, 2025
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Title 30
Chapter I
Part 23 - PART 23—TELEPHONES AND SIGNALING DEVICES
§ 23.1 - Purpose.
§ 23.2 - Definitions.
§ 23.3 - Application procedures and requirements.
§ 23.4 - [Reserved]
§ 23.5 - Conditions governing investigations.
§ 23.6 - General requirements for approval.
§ 23.7 - Specific requirements for approval.
§ 23.8 - Inspection and tests.
§ 23.9 - Special requirements for complete devices.
§ 23.10 - Material required for MSHA records.
§ 23.11 - How approvals are granted.
§ 23.12 - Wording, purpose, and use of approval plate.
§ 23.13 - Withdrawal of approval.
§ 23.14 - Instructions for handling future changes in design.
authority:
30 U.S.C. 957
,
961
source:
Schedule 9B, 4 FR 1555, Apr. 11, 1939, unless otherwise noted.
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